water in the floor

I started with leaks from all of those mentioned, plus more. Any of the metal flanges around the firewall and cowl can leak. Screw holes, cable holes, any mounting hole through firewall or sides. On big one for me was on the side under the cowl drain. Water was coming out the drain and going right in under it where a spot rusted away the flange of the side panel underneath it. I just kept getting under dash and looking where water was coming in till I got them all (which I think I have finally done)